31001013133421 has 2 divisors, whose sum is σ = 31001013133422. Its totient is φ = 31001013133420.

The previous prime is 31001013133417. The next prime is 31001013133429. The reversal of 31001013133421 is 12433131010013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20260252297321 + 10740760836100 = 4501139^2 + 3277310^2 .

It is a cyclic number.

It is not a de Polignac number, because 31001013133421 - 2² = 31001013133417 is a prime.

It is a super-2 number, since 2×31001013133421² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31001013133429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500506566710 + 15500506566711.

It is an arithmetic number, because the mean of its divisors is an integer number (15500506566711).

Almost surely, 2^{31001013133421} is an apocalyptic number.

It is an amenable number.

31001013133421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31001013133421 is an equidigital number, since it uses as much as digits as its factorization.

31001013133421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31001013133421 its reverse (12433131010013), we get a palindrome (43434144143434).

The spelling of 31001013133421 in words is "thirty-one trillion, one billion, thirteen million, one hundred thirty-three thousand, four hundred twenty-one".